The worst thing was even my 8 year old daughter could tell that it was a helicopter by eye, so they were close enough. Red Arrows commentator mentioned that the heli called Luton for a traffic service and Luton then informed Old Warden/Red Arrows. How hard is it to read a Notam?

Edit - to say that it was still a great display and both kids are still talking about it. My son thinks it's great to talk like the red arrow commands "Foooood.... GO! Pyjama... GO!" and is trying to grab my headset now... if only I could fly like them

Aside from that apparent incident, comments elsewhere seem to suggest that the new CAA regulations haven't exactly enhanced the air show experience there, due to changes in display lines etc. If true, that's a shame...

Highland Park, I did notice that, at this years Swansea air show, it was noticebly less exciting, the display line was a long way away (tbh I think the organisers gold plated the new rules, they said the buoys were 300m out from the crowd line, I reckon they were 4-500m out)